<template>
    <div class="bottom-menu">
        <check-button class="select-all" @checkBtnClick="checkBtnClick" v-model="isSelectAll"></check-button>
        <span>全选</span>
        <span class="total-price">合计: ¥{{ totalPrice }}</span>
        <span class="buy-product">去计算({{$store.getters.cartCount}})</span>
    </div>
</template>

<script>
import CheckButton from '../childComps/CheckButton'
export default {
    name: 'BottomBar',
    components: {
        CheckButton
    },
    data () {
        return {

        }
    },
    computed: {
        totalPrice () {
            const cartList = this.$store.getters.cartList;
            return cartList.filter(item => {
                return item.checked
            }).reduce((preValue, item) => {
                return preValue + item.count * item.newPrice
            }, 0).toFixed(2)
        },
        isSelectAll () {
            return this.$store.getters.cartList.find(item => item.checked === false) === undefined;
        }
    },
    methods: {
        checkBtnClick () {
            // 1.判断是否有未选中的按钮
            let isSelectAll = this.$store.getters.cartList.find(item => !item.checked);
            // 2.有未选中的内容, 则全部选中
            if (isSelectAll) {
                this.$store.state.cartList.forEach(item => {
                    item.checked = true;
                });
            } else {
                this.$store.state.cartList.forEach(item => {
                    item.checked = false;
                });
            }
        }
    }
}
</script>

<style scoped>
.bottom-menu {
    width: 100%;
    height: 44px;
    background-color: #eee;
    position: fixed;
    bottom: 50px;
    left: 0;
    box-shadow: 0 -2px 3px rgba(0, 0, 0, 0.2);
    font-size: 14px;
    color: #888;
    line-height: 44px;
    padding-left: 35px;
    box-sizing: border-box;
}

.bottom-menu .select-all {
    position: absolute;
    line-height: 0;
    left: 12px;
    top: 13px;
}

.bottom-menu .total-price {
    margin-left: 15px;
    font-size: 16px;
    color: #666;
}

.bottom-menu .buy-product {
    background-color: orangered;
    color: #fff;
    width: 100px;
    height: 44px;
    text-align: center;
    line-height: 44px;
    float: right;
}
</style>